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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
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2 | /* |
3 | * RTC driver for Maxim MAX8907 | |
4 | * | |
5 | * Copyright (c) 2011-2012, NVIDIA Corporation. | |
6 | * | |
7 | * Based on drivers/rtc/rtc-max8925.c, | |
8 | * Copyright (C) 2009-2010 Marvell International Ltd. | |
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9 | */ |
10 | ||
11 | #include <linux/bcd.h> | |
12 | #include <linux/i2c.h> | |
13 | #include <linux/mfd/max8907.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/regmap.h> | |
17 | #include <linux/rtc.h> | |
18 | #include <linux/slab.h> | |
19 | ||
20 | enum { | |
21 | RTC_SEC = 0, | |
22 | RTC_MIN, | |
23 | RTC_HOUR, | |
24 | RTC_WEEKDAY, | |
25 | RTC_DATE, | |
26 | RTC_MONTH, | |
27 | RTC_YEAR1, | |
28 | RTC_YEAR2, | |
29 | }; | |
30 | ||
31 | #define TIME_NUM 8 | |
32 | #define ALARM_1SEC (1 << 7) | |
33 | #define HOUR_12 (1 << 7) | |
34 | #define HOUR_AM_PM (1 << 5) | |
35 | #define ALARM0_IRQ (1 << 3) | |
36 | #define ALARM1_IRQ (1 << 2) | |
37 | #define ALARM0_STATUS (1 << 2) | |
38 | #define ALARM1_STATUS (1 << 1) | |
39 | ||
40 | struct max8907_rtc { | |
41 | struct max8907 *max8907; | |
42 | struct regmap *regmap; | |
43 | struct rtc_device *rtc_dev; | |
44 | int irq; | |
45 | }; | |
46 | ||
47 | static irqreturn_t max8907_irq_handler(int irq, void *data) | |
48 | { | |
49 | struct max8907_rtc *rtc = data; | |
50 | ||
75ea799d | 51 | regmap_write(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0); |
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52 | |
53 | rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF); | |
54 | ||
55 | return IRQ_HANDLED; | |
56 | } | |
57 | ||
58 | static void regs_to_tm(u8 *regs, struct rtc_time *tm) | |
59 | { | |
60 | tm->tm_year = bcd2bin(regs[RTC_YEAR2]) * 100 + | |
61 | bcd2bin(regs[RTC_YEAR1]) - 1900; | |
62 | tm->tm_mon = bcd2bin(regs[RTC_MONTH] & 0x1f) - 1; | |
63 | tm->tm_mday = bcd2bin(regs[RTC_DATE] & 0x3f); | |
75ea799d | 64 | tm->tm_wday = (regs[RTC_WEEKDAY] & 0x07); |
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65 | if (regs[RTC_HOUR] & HOUR_12) { |
66 | tm->tm_hour = bcd2bin(regs[RTC_HOUR] & 0x01f); | |
67 | if (tm->tm_hour == 12) | |
68 | tm->tm_hour = 0; | |
69 | if (regs[RTC_HOUR] & HOUR_AM_PM) | |
70 | tm->tm_hour += 12; | |
71 | } else { | |
72 | tm->tm_hour = bcd2bin(regs[RTC_HOUR] & 0x03f); | |
73 | } | |
74 | tm->tm_min = bcd2bin(regs[RTC_MIN] & 0x7f); | |
75 | tm->tm_sec = bcd2bin(regs[RTC_SEC] & 0x7f); | |
76 | } | |
77 | ||
78 | static void tm_to_regs(struct rtc_time *tm, u8 *regs) | |
79 | { | |
80 | u8 high, low; | |
81 | ||
82 | high = (tm->tm_year + 1900) / 100; | |
83 | low = tm->tm_year % 100; | |
84 | regs[RTC_YEAR2] = bin2bcd(high); | |
85 | regs[RTC_YEAR1] = bin2bcd(low); | |
86 | regs[RTC_MONTH] = bin2bcd(tm->tm_mon + 1); | |
87 | regs[RTC_DATE] = bin2bcd(tm->tm_mday); | |
75ea799d | 88 | regs[RTC_WEEKDAY] = tm->tm_wday; |
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89 | regs[RTC_HOUR] = bin2bcd(tm->tm_hour); |
90 | regs[RTC_MIN] = bin2bcd(tm->tm_min); | |
91 | regs[RTC_SEC] = bin2bcd(tm->tm_sec); | |
92 | } | |
93 | ||
94 | static int max8907_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
95 | { | |
96 | struct max8907_rtc *rtc = dev_get_drvdata(dev); | |
97 | u8 regs[TIME_NUM]; | |
98 | int ret; | |
99 | ||
100 | ret = regmap_bulk_read(rtc->regmap, MAX8907_REG_RTC_SEC, regs, | |
101 | TIME_NUM); | |
102 | if (ret < 0) | |
103 | return ret; | |
104 | ||
105 | regs_to_tm(regs, tm); | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
110 | static int max8907_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
111 | { | |
112 | struct max8907_rtc *rtc = dev_get_drvdata(dev); | |
113 | u8 regs[TIME_NUM]; | |
114 | ||
115 | tm_to_regs(tm, regs); | |
116 | ||
117 | return regmap_bulk_write(rtc->regmap, MAX8907_REG_RTC_SEC, regs, | |
118 | TIME_NUM); | |
119 | } | |
120 | ||
121 | static int max8907_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
122 | { | |
123 | struct max8907_rtc *rtc = dev_get_drvdata(dev); | |
124 | u8 regs[TIME_NUM]; | |
125 | unsigned int val; | |
126 | int ret; | |
127 | ||
128 | ret = regmap_bulk_read(rtc->regmap, MAX8907_REG_ALARM0_SEC, regs, | |
129 | TIME_NUM); | |
130 | if (ret < 0) | |
131 | return ret; | |
132 | ||
133 | regs_to_tm(regs, &alrm->time); | |
134 | ||
135 | ret = regmap_read(rtc->regmap, MAX8907_REG_ALARM0_CNTL, &val); | |
136 | if (ret < 0) | |
137 | return ret; | |
138 | ||
139 | alrm->enabled = !!(val & 0x7f); | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
144 | static int max8907_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
145 | { | |
146 | struct max8907_rtc *rtc = dev_get_drvdata(dev); | |
147 | u8 regs[TIME_NUM]; | |
148 | int ret; | |
149 | ||
150 | tm_to_regs(&alrm->time, regs); | |
151 | ||
152 | /* Disable alarm while we update the target time */ | |
75ea799d | 153 | ret = regmap_write(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0); |
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154 | if (ret < 0) |
155 | return ret; | |
156 | ||
157 | ret = regmap_bulk_write(rtc->regmap, MAX8907_REG_ALARM0_SEC, regs, | |
158 | TIME_NUM); | |
159 | if (ret < 0) | |
160 | return ret; | |
161 | ||
162 | if (alrm->enabled) | |
75ea799d | 163 | ret = regmap_write(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0x77); |
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164 | |
165 | return ret; | |
166 | } | |
167 | ||
168 | static const struct rtc_class_ops max8907_rtc_ops = { | |
169 | .read_time = max8907_rtc_read_time, | |
170 | .set_time = max8907_rtc_set_time, | |
171 | .read_alarm = max8907_rtc_read_alarm, | |
172 | .set_alarm = max8907_rtc_set_alarm, | |
173 | }; | |
174 | ||
5a167f45 | 175 | static int max8907_rtc_probe(struct platform_device *pdev) |
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176 | { |
177 | struct max8907 *max8907 = dev_get_drvdata(pdev->dev.parent); | |
178 | struct max8907_rtc *rtc; | |
179 | int ret; | |
180 | ||
181 | rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); | |
182 | if (!rtc) | |
183 | return -ENOMEM; | |
184 | platform_set_drvdata(pdev, rtc); | |
185 | ||
186 | rtc->max8907 = max8907; | |
187 | rtc->regmap = max8907->regmap_rtc; | |
188 | ||
ac4e7d49 | 189 | rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, "max8907-rtc", |
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190 | &max8907_rtc_ops, THIS_MODULE); |
191 | if (IS_ERR(rtc->rtc_dev)) { | |
192 | ret = PTR_ERR(rtc->rtc_dev); | |
193 | dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret); | |
194 | return ret; | |
195 | } | |
196 | ||
197 | rtc->irq = regmap_irq_get_virq(max8907->irqc_rtc, | |
198 | MAX8907_IRQ_RTC_ALARM0); | |
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199 | if (rtc->irq < 0) |
200 | return rtc->irq; | |
94c01ab6 | 201 | |
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202 | ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL, |
203 | max8907_irq_handler, | |
204 | IRQF_ONESHOT, "max8907-alarm0", rtc); | |
2fa76062 | 205 | if (ret < 0) |
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206 | dev_err(&pdev->dev, "Failed to request IRQ%d: %d\n", |
207 | rtc->irq, ret); | |
94c01ab6 | 208 | |
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209 | return ret; |
210 | } | |
211 | ||
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212 | static struct platform_driver max8907_rtc_driver = { |
213 | .driver = { | |
214 | .name = "max8907-rtc", | |
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215 | }, |
216 | .probe = max8907_rtc_probe, | |
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217 | }; |
218 | module_platform_driver(max8907_rtc_driver); | |
219 | ||
220 | MODULE_DESCRIPTION("Maxim MAX8907 RTC driver"); | |
221 | MODULE_LICENSE("GPL v2"); |